Your fuel pump is a vacuum source and is sucking on the tank.

Pontoon boat gas tank vent. Moeller EPA Portable Plastic 6-Gallon Fuel Tank. Save 508 73 Off Save an EXTRA 60. Which does not include foam or fiberglass.

Shop our site and save. Slow fueling splash-back and air sucking into the tank when the cap is opened to fill problems can often come from a venting issue common with with the inlet control valve P-trap or fill see diagram above. With no way to replace the volume in the tank that the fuel occupied vent closed tank goes into the vacuum state also.

During storage the vent must be kept closed to prevent evaporation and loss of your fuel as well as to prevent dangerous fumes from escaping which could cause an explosion. 200 coupon applied at checkout Save 200 with coupon. Boat fuel tank vent how to boating diy fuel tank draining great lakes scuttle gas tank cap pontoon forum get help with your how to install a fuel water separator boating 13 gallon epa redi tank permanent below deck fuel pontoon.

China 7 5m Quality Aluminum Pontoons For Pontoon Boat. The fuel level of your tank changes throughout the day even if you are not driving it. Finally an equilibrium is reached and it just quits as does your engine.

We strive to give you the best choice of the most popular fuel system parts in order to make it easy for you to get back on the water. It needs to be open when operating your motor. With the hole facing towards the sky allowing water to get into it.

Also you cannot fill these tanks completely as they have an air gap purposely designed in them to allow for expansion. If you do not open the vent your motor will experience a vacuum lock. Choosing the correct fuel system for your pontoon boat is a critical decision.